String[] inputs = { "input" };
        CharMappingItem item = new CharMappingItem(1L, inputs, "line1\nline2");

        assertEquals("line1 line2", item.getOutput());
    }

    public void test_constructor_withNullOutput() {
        // Test with null output
        String[] inputs = { "input" };
        CharMappingItem item = new CharMappingItem(1L, inputs, null);

        assertNull(item.getOutput());
    }